Cinder absolute-limits tests

Added a volume limits client

Added testcase:
- show cinder absolute-limit api

Tests:
 - tests get absolute limits and verify counter and defaults.

Change-Id: I35ac2aeae7e9bda8db69fbc8bf625db1839412ed
diff --git a/releasenotes/notes/new-volume-limit-client-517c17d9090f4df4.yaml b/releasenotes/notes/new-volume-limit-client-517c17d9090f4df4.yaml
new file mode 100644
index 0000000..033e147
--- /dev/null
+++ b/releasenotes/notes/new-volume-limit-client-517c17d9090f4df4.yaml
@@ -0,0 +1,3 @@
+---
+features:
+  - The volume_limits client was added to tempest.lib.